Răspuns :
a)14=6(x+5)
14=6x+30
-6x=30-14
-6x=16
x=-8/3
b)2(4x+5)=6
4x+5=3
4x=3-5
4x=-2
x=-1/2
c)3(x+2)=12
x+2=4
x=4-2
x=2
d)3(1+5x)=8
3+15x=8
15x=8-3
15x=5
x=1/3
e)2(5-7x)=3
10-14x=3
-14x=3-10
-14x=-7
x=1/2
f)5(2-3x)=7
10-15x=7
-15x=7-10
-15x=-3
x=1/5